Thermometer-tube



(No Model.)

' H. WEINHAGEN.

Thermometer Tube.

UNITED STATES HENRY WEINHAGEN, OF HOBOKEN, NEW JERSEY.

THERMOMETER-TUBE.

SPECIFICATION forming part of Letters Patent No. 233,586, dated October 19, 1880. Application tiled July 19, 1880. (No model.)

To all whom it may concern:

Be it known that I, HENRY WEINHAGEN, of Hoboken, in the county of Hudson and Sta-te of New Jersey, have invented certain new and useful Improvements in Thermometer-Tubes, of which the following` is a speeication.

The object of my invention is to produce a thermometer-tube wherein the appearance of the column of mercury and the graduations of the thermometric scale marked thereon will be enlarged or magnified so that they can be readily seen, and, moreover, to so construct the tube as to preclude it from rolling.

The invention consists in a thermometertube having a flat bore, a liat back, and sides forming acute angles with said back and converging toward and joining each other at an acute angle opposite said fiat bore, so as to form a prismatic front, said tube being not liable to roll, and the dat bore and prismatie front contributing` to conspicuously display the column of mercury.

In the accompanying|` drawings, Figure l is a face view of a thermometer-tube embodying Iny invention, and Fig. 2 is a transverse section ofthe same upon an enlarged scale.

Similar letters ot' reference designate corresponding parts in both iigures.

The th ermometer-tube is triangular in shape, and has a at back, A, which will rest against any support onv which it may be placed or to which it may be attached, and will preclude it from rolling thereon. It also forms a surface on which the graduation of the thermometric scale can be easily and accuratelyr marked by scratchin g, etching, or otherwise.

B and G designate, respectively, the two sides of the tube, which join the back at acute angles, and which converge toward the front and join each other at/an acute angle opposite the bore D. lhe tube is made as sharp as possible at its junction, and forms a prismatic portion or front, which spreads or laterally enlarges the appearance ot' the column ot' mercury or like material in the bore and the therinometric graduations, and enables them to be seen without trouble. The bore is flat or elliptical, and arranged with its broad side toward the front, so as to be as prominently in view asl possible, and coirtributing, with the prismatic front, to prominently display the column ot' mercury. The prism atie front and the nat bore together serve to render the column ot' mercury, even when very small, very perspicuous.

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

A thermometer-tube having a tlat bore, a flat back, and sides forming acute angles with said back, and converging toward and joining each other at an acute angle opposite said ilat bore, so as to form a prismatic front, said tube being not liable to roll, and the flat bore and prismatic front contributing to conspicuously display the column of mercury, substantially as specified.

Witnesses: H. VEIN HAGEN.

EDWiN H. BROWN, T. J. KEANE. 

